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authorEgbert Eich <eich@suse.com>2013-07-17 17:07:27 +0400
committerDave Airlie <airlied@redhat.com>2013-07-30 03:44:42 +0400
commitde7500eafc96274654201bd585fb85e2814ef9b2 (patch)
tree4e5a3782b903c7ebeb04011e6a0c8ec82dddbaab /drivers/gpu/drm/mgag200
parentda55839870263563cc70e700a7f58090a860576d (diff)
downloadlinux-de7500eafc96274654201bd585fb85e2814ef9b2.tar.xz
drm/mgag200: Fix LUT programming for 16bpp
Since there are only 32 (64) distinct color values for each color in 16bpp Matrox hardware expects those in a 'dense' manner, ie in the first 32 (64) entries of the respective color. Signed-off-by: Egbert Eich <eich@suse.de> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/mgag200')
-rw-r--r--drivers/gpu/drm/mgag200/mgag200_mode.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index c8983f92bc67..503a414cbdad 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -29,6 +29,7 @@ static void mga_crtc_load_lut(struct drm_crtc *crtc)
struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
struct drm_device *dev = crtc->dev;
struct mga_device *mdev = dev->dev_private;
+ struct drm_framebuffer *fb = crtc->fb;
int i;
if (!crtc->enabled)
@@ -36,6 +37,28 @@ static void mga_crtc_load_lut(struct drm_crtc *crtc)
WREG8(DAC_INDEX + MGA1064_INDEX, 0);
+ if (fb && fb->bits_per_pixel == 16) {
+ int inc = (fb->depth == 15) ? 8 : 4;
+ u8 r, b;
+ for (i = 0; i < MGAG200_LUT_SIZE; i += inc) {
+ if (fb->depth == 16) {
+ if (i > (MGAG200_LUT_SIZE >> 1)) {
+ r = b = 0;
+ } else {
+ r = mga_crtc->lut_r[i << 1];
+ b = mga_crtc->lut_b[i << 1];
+ }
+ } else {
+ r = mga_crtc->lut_r[i];
+ b = mga_crtc->lut_b[i];
+ }
+ /* VGA registers */
+ WREG8(DAC_INDEX + MGA1064_COL_PAL, r);
+ WREG8(DAC_INDEX + MGA1064_COL_PAL, mga_crtc->lut_g[i]);
+ WREG8(DAC_INDEX + MGA1064_COL_PAL, b);
+ }
+ return;
+ }
for (i = 0; i < MGAG200_LUT_SIZE; i++) {
/* VGA registers */
WREG8(DAC_INDEX + MGA1064_COL_PAL, mga_crtc->lut_r[i]);